the mystery of the wonky corners

[kingcreaky]

Gents.

Hope somebody clever than I is about this evening....

So doing some mild pocketing in ply... this is meant to be square


see how its rounded the edges of two of the corners but not of the other two?

this is compounded, by the other pocket its doing on the same job has done the same thing


It must be something physical with the machine rather than software because the toolpath looks fine in vcarve


only thing ive changed today is... ive tightened the belts... but it jogs around fine.... and ive increased the acceleration on X

ANY ideas will be welcome... im scratching my head.


looking at both the photos X is vertical... Y is horizontal